Choose the region of the spectrum which would be used to determine the structure of crystalline solids:
Correct answer: C. X rays
- A. visible
- B. infrated
- C. X rays
- D. ultraviolet
Explanation
To determine the structure of crystalline solids, the spacing between the atoms of crystal (i.e. in the order of 10¹⁰ or degree angstroms Å) should correspond to the wavelength of the region of the spectrum used. Its wavelength is on the order of 10⁻¹² to 10⁻⁸.This wavelength range corresponds to the spacing between atoms of crystal. Thus, option C is correct.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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